Long life lamp demonstrator



March 21, 1961 F. c. R. GREEN 2,976,482

LONG LIFE LAMP DEMONSTRATOR I Filed June 26, 1958 2 Sheets-Sheet 1 Fig.

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LONG LIFE LAMP DEMONSTRATOR Filed June 26, 1958 2 Sheets-Sheet 2 Fig. 2

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United States Patent LONG LIFE LAMP DEMONSTRATOR- Francis CharlesRichard Green, 641 Evergreen Place,

North Vancouver, British Columbia, Canada Filed June 26, 1958, Ser. No. 744,840

2 Claims. (CL 324-20) This invention relates to a demonstration and test device for electric lamps.

An object of the invention is to provide an instrument for performing a plurality of tests on electric lamps to show the comparative quality between lamps.

A further object of the invention is to provide a practical, mechanically simple instrument for not only demonstrating by actual test the superiority ofelectric lamps, but also to facilitate the storage of electric lamps and sundry other material ordinarily found useful in the promotion and sale of electric lamps.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a perspective view of an instrument constructed in accordance with the invention.

Figure 2 is an elevational view of the device in Figure 1 with the door in an open position.

Figure 3 is a sectional view taken on the line 3-3 of Figure 2.

Figure 4 is a sectional view taken on the line 4-4 of Figure 3.

Figure 5 is a wiring diagram of the instrument.

In the accompanying drawings there is an instrument '10 by which to aid in the promotion, sale, etc. of electric lamps and also to provide a handy carrying case for various data, papers, lamps and other material that the demonstrator wishes to have at hand. Accordingly, the instrument is constructed of a case 12 having four side walls, a bottom 14 and a door 16 connected to side wall 18 by hinge 20. Side wall 22 has a handle 24 and a latch 26 for maintaining the door 16 in the closed position. The latch can be one of many types that are commercially available. However, it is suggested that provision be made for a lock in the latch. Resilient feet 28 are attached to bottom 14 so that the instrument can be nicely supported on a table or some other surface.

Support 30 is attached in the case 12 and is of irregular shape, having an upper panel 32 and a lower panel 34 spaced from the entrance 36 that is controlled by door 16 and also spaced from the bottom 14. Panel 38 is attached to panels 32 and 34 at right angles to it and is spaced slightly from side 22 in order to form a compartment 40 within which a salesmans order book or other material can be carried. Small pockets 42 and 44 are formed by slots in panel 3-2 and linings in registry with the slots and behind panel 32. The pockets 42 and 44 can hold advertising cards, representatives calling cards, etc.

As shown in Figure 2, panel 32 has a fixed output or variable transformer 46 or Variac mounted in an opening 48 therein. 50 and a scale 52 coacting with apointer on the knob. The scale is graduated in volts A.C. A conventional ammeter 54 is similarly mounted in an opening in panel The variable transformer has a knob 32 and the same holds true for a conventional voltmeter 56. Indicating lamp 58 is disposed in a socket 60,- the latter carried by panel 32 and fitted in an opening. in that panel, Panel 34 has a test lamp socket 6 2 within which test lamp 64 is adapted to be screwed or otherwise temporarily held in place, socket 62 being in the extra lamp storage compartment.

The wiring diagram of Figure 5 shows the circuit of the instrument with the exception of a watt meter which can be connected in the customary way to the circuit on the output side of the variable transformer 46. A line cord or cable 68 is adapted to be connected with an A.C. source which will usually be of a house current value, for instance 117' volts A.C. A manual control switch 70 is in one side of the line, and the socket for lamp 58 is connected across the lines and between the switch 70 and the input terminals of the variabletransformer 46. The'output terminals of the transformer have the ammeter 54 and the test lampsocket 62 for test lamp 64 connected thereto with the ammeter and socket 62in series. Conductor74 is connected in parallel with the output terminals of transformer 46, and they have the volt meter 56 connected therein.

In use, an actual demonstration is conducted in the. following manner: First an endeavor is made to prove the lasting qualities of a particular lamp by accelerated life tests. This is done by first placing a competitors 750 hour or 1000 hour lamp, designed to operate at volts, in the lamp receptacle or socket 62. The switch 70 is closed and the transformer knob is turned in a clockwise direction as viewed in Figure 2. The voltage being applied is registered accurately on the volt meter and at the same time the current consumption is registered "by the A.C. ammeter. The purpose of this part of the demonstration is to prove or show that when the voltage is increased, an ordinary 750 hour or 1000 hour lamp, designed to operate at 120 volts A.C., will generally burn out in approximately 1 second when as little as 200 or 220 volts potential is applied.

Next, one of the superior lamps is inserted in the same socket 62, after removing the competitors now burned out lamp. The variable transformer is now adjusted until the A.C. volt meter registers 270 volts. The superior lamp will last for a longer time, for instance 15 to 20 minutes at 270 volts, as compared to Isecond at 220 volts or lessby the 750 and 1000 hour lamps of the competitor.

Another test is made by turning up the transformer to 270 volts output as read on A.C. volt meter 56. -The switch 70 is then turned off and on applying the sudden 270 volt surge to the lamp in the test sockets 62.

The ammeter is also used to show the comparative current consumption of a 750 or 1000 hour lamp designed to burn 120 volts, as against current consumption of the superior lamp rated at 2500, 3400 and 5000 hours and designed to operate at 120, -130 volts potential. This test is demonstrated in the following manner: A competitors 750 or 1000 hour lamp designed to burn at 120 volts is placed in the socket 62. Variable transformer is then adjusted slowly and carefully until the A.C. voltmeter registers exactly 120 volts. Assuming the use of a competitors 60 watt bulb, the current consumption is carefully noted as registered by the ammeter. Leaving the A.C. volt meter reading set at 120 volts, the competitors 60 watt, 120 volt lamp is removed from the test socket 62 and one of the superior 60 watt, 2500, 3400 or 5000 hour lamps is inserted in the socket 62 with the voltage still set at exactly 120 volts. The current consumption of the lamp in the socket can now be read on the ammeter and compared against the current consumption of the competitors lamp.

The foregoing is considered as illustrative only of the scribed, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A sales device to demonstrate the life and economy of an electric lamp by sequentially performed comparative current consumption tests, accelerated life voltage tests and surge current shock tests, comprising a casing, a line cord adapted to connect with a source of A.C. potential, a continuously adjustable transformer having input and output terminals respectively and adapted to step up the voltage at the output terminals to ultimately show the relative current consumption of lamps of difierent voltage design and also the lasting qualities of lamps of difierent voltage design, a single test socket connected with said output terminals and within which demonstration lamps are adapted to be inserted and retained while the transformer is adjusted to provide a steady voltage in excess of the rated voltage of the lamp or to apply surge voltage in excess of the rated voltage of the lamp being tested, an ammeter connected in series with said socket for comparing relative current consumption without comparing lamp brilliance, a volt meter connected in parallel with said socket for matching rated lamp voltages and determining "breakdown voltage in the comparative accelerated life voltage tests, a pilot lamp connected across said line, an upper panel in said casing to which said volt meter and ammeter and said variable transformer are secured, a lower panel in said casing and supporting said test socket, sides attached to said panels, said upper panel having apertures which open into storage areas defined by said lower panel and portions of said sides, and at least one compartment in said casing and within which to accommodate additional sales material.

2. A device to demonstrate the long life of an electric lamp in accordance with claim 1 wherein said casing has side walls, an open top and a closure on said open top, said casing having a bottom, said lower panel disposed in said casing and parallel to said casing bottom and slightly spaced therefrom to form a chamber between said bottom of said casing and said lower panel, said test socket located on said lower panel, said lower panel having an aperture through which the wiring for said test socket extends to enter said chamber.

References Cited in the file of this patent UNITED STATES PATENTS 

